T-SQL: Stored Procedures (UPDATE), UPDATE An Existing Product In Northwind Part 4

Here is how you would create a stored procedure to update an a new record into the Products table in the Northwind database.

USE Northwind
GO
CREATE PROCEDURE dbo.updProduct(
 @ProductID int,
 @ProductName nvarchar(40),
 @SupplierID int = null,  --default is null
 @CategoryID int = null,
 @QuantityPerUnit nvarchar(20) = null,
 @UnitPrice money = null,
 @UnitsInStock smallint = null,
 @UnitsOnOrder smallint = null,
 @ReorderLevel smallint = null,
 @Discontinued bit)
AS
UPDATE Products 
 SET ProductName = @ProductName,
  SupplierID = @SupplierID,
  CategoryID = @CategoryID,
  QuantityPerUnit = @QuantityPerUnit,
  UnitPrice = @UnitPrice,
  UnitsInStock = @UnitsInStock,
  UnitsOnOrder = @UnitsOnOrder,
  ReorderLevel = @ReorderLevel,
  Discontinued = @Discontinued
WHERE Products.ProductID = @ProductID
GO

When you see a parameter with the = null, it means the field can have a null value. Since we need ProductID is needed to update a specific record we need it in the input parameter list. The data types must match the fields in the database.
Now lets find an existing record in the database, let's use the product with the ProductID of 1

Here is how you would execute the stored procedure

EXEC dbo.updProduct 
 @ProductID = 1,
 @ProductName ='Teh Tarik',
 @SupplierID = DEFAULT,
 @CategoryID = DEFAULT,
 @QuantityPerUnit ='20 boxes x 12 oz.',
 @UnitPrice = 12.99,
 @UnitsInStock = 5,
 @UnitsOnOrder = 6,
 @ReorderLevel = DEFAULT,
 @Discontinued = 0

When you see a parameter with = DEFAULT it means to assign the DEFAULT value to the field, if the execution is completed successfully you should see the message.

(1 row(s) affected)
Here is how the updated row looks like now.

Blogs In the T-SQL Series:

• T-SQL: Stored Procedure (INSERT), INSERT A New Product In Northwind Part 1
• ASP.NET : Stored Procedures (INSERT), Insert a new Northwind Product Part 2
• T-SQL: Stored Procedures (DELETE), DELETE An Existing Northwind Product Part 3
• T-SQL: Stored Procedures (UPDATE), UPDATE An Existing Product In Northwind Part 4
• T-SQL: Stored Procedures (SELECT), SELECT Products and The Supplier Part 5
• ASP.NET: Calling Stored Procedure With A Parameter With SqlParameter Part 6
• ASP.NET: Get a Single Value From a Stored Procedure Part 7
• SQL Server: Granting Access Permissions to Stored Procedures For IIS Part 8